Sendmail Configuration

We are using Sendmail 8.8.5 on Unix SCO Open Server 5.0.4, we are
facing the below problem in Sendmail configuration.

Sender is not getting reply message for Undelivered messages when the
filesize exceeds the limits of sendmail.cf (Sendmail Configuration file)
We are not able to keep the required options in senmail.cf

First Belated Happy New Year To All Of
i have configured sendmail on my linux server. and problem is that my
outgoing mail is
not going outside (intrnal user can recieve internal mail and send mail and
incoming mails coming from outside ,
but outgoing mail is not going from linux server, i think problem in smtp,
but im unable to find problem. so plese help me help me .

error message is
451 4.4.1 reply: read error from mail.domain.com<email@removed... Deferred: Connection timed out with
mail.domain.comWarning: message still undelivered after 15 minutes
Will keep trying until message is 1 hour old

A few suggestions.
Is outgoing port 25 blocked?
Do you have mailhost setup in /etc/hosts or dns?
Is a relay server setup in the sendmail.cf file?
Have you tried any of the sendmail debug modes to connect to the mailhost?

A Happy New Year to you as well,
It is possible that something between you and the outside world could be causing the problem for you since all mail domains are giving you the temp error message. It could be:
1. The firewall
2. A spam filter, onsite or an external ISP.
3. Your ISP not allowing Port 110 traffic, but allowing Port 25.

Hello all,
I am new to Linux & do look forward for your help for the sendmail
configuration.....
I wanted to configure sendmail configuration so that I can send & receive
mails thru outlook at client side.......Its fine if only internal users can
access that........

Can someone help me in this..........Thanks in advance.....
Regards,
Ankur

Please make sure that the mail server has a route for the "outside" network, an out of the box mail server usually does not have problems sending(forwarding) mails. I suggest you first do the following

1- ping an outside ip address (to see if name resolution and ip routing is in place)

2- do a simple mail via telnet-ing the mail server to see if sends mail to a, say, Yahoo address. (this usually happens if IP is working and u are using a healthy sendmail server whose configurations are just default, just dont change any file after intalling the rpm or distro.

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